Preliminary study on pressure brazing and diffusion welding of Nb-1Zr to Inconel 718

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Welding Journal (Miami); (USA)

OSTI ID:6816160

Moore, T J ^[1]

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1. National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center

Future space power systems may include Nb-1Zr/Inconel 718 dissimilar metal joints for operation at 1000 K for 60,000 h. In this study, the serviceability of pressure-brazed and diffusion-welded joints was investigated. Nickel-based metallic glass foil filler metals were used for brazing. Nickel and iron foils were used as diffusion welding interlayers. Joint soundness was determined by metallographic examination in the as-brazed and as-welded condition, after aging at 1000 K, and after thermal cycling. Brazed joints thermally cycled in the as-brazed condition and diffusion-welded joints were unsatisfactory because of cracking problems. Brazed joints may meet the service requirements if the joints are aged at 1000 K prior to thermal cycling.

• OSTI ID: 6816160
• Journal Information: Welding Journal (Miami); (USA), Journal Name: Welding Journal (Miami); (USA) Vol. 69:3; ISSN 0043-2296; ISSN WEJUA
• Country of Publication: United States
• Language: English

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